Filter.



PATENTED JUNE 16, 1908.

E. M. KNIGHT.

FILTER.

APPLIOATION FILED JAN. 21', 190B.

3 SHEETS-SHEET 1.

IN VEN TOR WITNESSES:

No. 890,989. PATENTED JUNE 16, 1908.

E. M. KNIGHT.

FILTER.

APPLICATION FILED JAN. 21, 1008.

3 SHEETS-SHEET 2.

g I u i 5 Ill/ll llllllllllllll//) /y/llllllllll PATENTED JUNE 16, 1908.E. M. KNIGHT.

FILTER.

APPLIGATION FILED JAN.21, 1908.

3 SHEETSSHEET 3,

IN VEN TOR WITNESSES:

- tion of a filter closed on one side.

PATENT OFFICE. I

EDWARD'M. KNIGHT, OF SAN FRANCISCO, CALIFORNIA.

Specification of Letters Patent.

FILTER. I

Patented June 16, 1908.

Application filed January 21, 1908. Serial No. 411,926.

To all whom it "may concern:

Be it known that I, EDWARD M. KNIGHT,

citizen of the United States, residing in the I city and'county of SanFrancisco and State of'California, have invented new and usefulImprovements in Filters, of which the fol lowing is a specification.

My invention relates primarily to that class of filters employing eithera fibrous material as a filtering medium, as a support for a filteringmedium, or media of asolidifid and porous character may be used inconnection with it. I

It consists of a rigid frame or casing with removable Water-tigl1t coveror covers,means for admitting and withdrawing a liquid; means forsecuring the purifying -m'edium within the frame, and in combinations ofparts, and details of construction which will be more fully explained byreference to the accompanying drawings, in which Figure 1 is a frontelevation and partial section of my apparatus. Fig. .2 is a-section online acx of Fig. l[ Fig. 3 is a similar sec- Figs. 4, 5 and 6 showdifferent positions of the outlet valve. Fig. 7 is a perspective view ofpart of the rim, lug, locking bolt, and nut with its conical extension.vice connected with a pump. Fig. 9 shows it connected with an adjacentvessel, with top discharge from the filter. Fig. 10 shows the connectionwith a tank above, with top inlet and bottom discharge throughstandpipe. Fig. 11 is a perspective view of a portion of the body andcover, with slotted ug showing its countersunk depression, looking bolt,and nut with its conical extension.

The object of my present invention is to improve the construction andthereby increase the efiiciency of such apparatus, by

constructing a filter embodying and com-- bining advantagescharacteristic of filters of low pressure or gravity ty e withadvantagesdistinctive of filters 0 high pressure type, so that it willpossess adaptability to work accurately under either system, gravity orpressure. I

In former patents issued to me I have shown various forms of filterframes or holders for employing a fibrous material; said holders orframes differingin construction, but all being alike in that theirimmersion in Fig. 8 shows the de a separate tank containing the liquidto b filtered or purified, was necessary to enable them to filter. Mypresent invention is designed to obviate the necessity of having toimmerse the frame holding the. filtering medium in the liquid to befiltered, and instead,

I have shown means for introducin the li uid to be filtered directlyinto the ame 1 ho ding or containing the filtering medium; thus 1 amenabled to dispense with the containing tank for the unfiltered liquid,though still retaining its advantages, for by this construction (asdescribed herein) I am still enabled (though dispensing with theseparate tank) to maintain a large superficial area of filtering orurifyin surface in a small area, and to emp oy purifiying media ofexceeding fineness and lightness of weight, and to hold such filteringmedia in position without injury to its delicate construction orcomposition or without disturbing any coating which may be spread ordeposited upon the surface of the fibrous materlal to act as a purifyingmedia, such as fine carbon in the form of paste, constituting an oozebed of an exceedingly delicate nature. The filtering media used,whatever its character, can be easily-inserted, or removed. The filtercan be operated by pressure or gravity. In the former case it is eitherattached to the ordinary service pipe (see Fig. 1) or subject topressure from a ump (see Fig. 8) ordinary regulating or chec valvesadjusting the pressure.

Working by gravity the filter is supplied from an adjacent tankcontaining theliquid body in any suitable or desired manner.

In the present case I have shown the body having the lugs '3 upon theperiphery, and

bolts 4 Figs. 2 7 and 11, have their inner ends 105,

pivoted to swing radially in these lugs.

These caps or covers are removably-fixed to the The covers or caps 2have similarly slotted lugs 5 in the form of segments, open at theirouter edges, so that the bolts swinging upon their pivots, may be turnedso as to lie Within the lugs 5 of the covers. These lugs arecountersunk, as shown.

The. bolts have their ends screw-threaded so that the bolts being swunginto place, and the ends lying within the slots of the lugs 5, nuts 6may be screwed upon the ends of the bolts until the parts are drawnsnugly together. I

In order to insure the parts fitting and remaining in their properposition, I have shownthe nuts having their inner ends made conical, asat 4*, and these conical inner ends fit into the countersunk sockets ofthe lugs 5, and insure the maintenance of the parts in their relativelocking position. In order to conveniently turn these nuts and toprevent them being tampered with by the use of an ordinary wrench, Iprefer to make the heads of the nuts pentagonal, and to use a socket keyof the same shape to turn them.

Around the periphery of the body and coincident therewith, in the coveror covers, are grooves or channels adapted to receive a packing gasket,as at 9, so that the device is ermetically sealed when the parts are inplace and lock nuts screwed down.

The fibrous material, such as asbestos cloth, or other similar material,is fixed withfibrous material and pressed down so that,

in the frame or case as follows: Surrounding the central portion of thebody is an annular flange 20, and within this flange is fitted a disk ofperforated material 21, which forms a support for the fibrous material22. This fibrous material is, as before stated, of woven asbestos, orother suitable textile. A sheet, of this woven material being laid uponthe perforated screen 21, its periphery extending over the rigid ring orflange 20, a loose flanged ring 23 is assed over the woven material, andpresse down so that the periphery of the woven material will be clampedbetween this loose ring 23 and the rigid ring 20. It will thus bestretched smoothly and closely over the screen 21. It may be coated withpulverized carbon; covered with com ressed material of a fibrous nature,or a ltering medium of solidified and porous character may be used; thethickness or density of the filtering mediaused being regulatedaccording to the pressure the filter is required to work under, and thenature of the impurity to be removed. A second sheet of woven or fibrousmaterial 24, to protect the carbon or other filtering media used, isthen placed over the first sheet of woven or fibrous material 22, itsperiphery extending over the rigid flange or ring 25. ring 26 is thenpassed over the periphery of this second or exterior sheet of woven orThe loose flanged the .eripheryof this second sheet .of woven or filrous material 24 is clamped between the loose ring 26 and the rigid ring25. Thus both the sheets of fibrous material 22 and 24 and theintervening filtering medium 22 are held firmly in place and preventedfrom being disturbed by any flow ofliquid over or through them.

This apparatus may be made with the body closed upon one side, and aremovable cap or cover u on the other, the inlet and outlet assagesieing so disposed upon opposite si( es of the body that the water iscompelled to pass through the purifying medium efore it can escape; orthe body may be The liquid to be filtered or purified enters.

through an inlet passage placed in the body, as at 7, and escapesthrough an outlet passage placed in the body, as at 8.

The filter can be entirely em tied at any time by means of discharge cocrs placed in the" body, one connectingwith the filtered water chamber,at 16, and the other with the unfiltered water chamber, at 16. By thusplacing the inlets and outlets and the filtering media within the mainbody, this main body portion remains intact, and continues fixed inplace, while the caps or covers may be readily removed for purposes ofinspection, cleansing, removal, or renewal of the filtering mediumwithout disturbing the main body of frame A.

A su ply of liquid to the filter is preferably cut off by means of avalve 10 situated at the exterior orifice of inlet 7 in the bod offilter, Figs. 1, 8 and 10. Thus,when the ter is not ,in o eration, allpressure upon it, and the puri ying media within it, is relieved, andany tendency to force impurities through such media is obviated.

When the filter is fitted in a perpendicular position with cut-ofi valveto inlet at base of filter, and outlet at the top of the filter, as inFigs. 1 and 8, the simple closing of the inlet valve 10 at the base ofthe filter cuts off the supply to, and consequent pressure on, thefilter, and causes the flow of water from the outlet at top of thefilter to immediately it is obvious that when the cut-oil valve 10 is llO closed, the outlet 8 being open, the filtered water in the filterwould not stop flowing, but would continue to flow until the'filter hademptied itself. Now to prevent this and to enable the inlet valve10'when it is situated at the top of the filter-to cut off the fiow'atthe outlet 8 when it is situated at the bottom of the filter, I fit astand-pipe into the inner orifice of the outlet 8, in Fig. 10, forfiltered water, said pipe reaching across the interior of the frame,until the end of it terminates only slightly below the plane of theinner orifice of inlet 7, Fig. 10, the intervening space between thisorifice and the orifice at the end of the tube thus being very slight.The result of this is that the filtered water in the filter will have torise to the top of this stand-pipe 30 where the only exit for it issituated, to enable it to pass out at outlet 8;.

and this it can only do when the inlet valve 10 is open, and pressure isallowed to exert itself on the body of water contained in the filter.Thus the closing of the inlet valve 10 cuts off the pressure, which inturn prevents the water rising to the height of the exit in stand-pi e,as it cannot do so without-pressure. T e result will be that the watercannot escape from outlet 7. Hence the action of this stand-pipe is tocause the opening of inlet valve 10 to simultaneously open inlet 7 andoutlet 8,and the closing of valve 10 simultaneously closes inlet 7 andoutlet 8.

The pressure within the filter is regulated by means of an ordinarypressure regulating valve, and the filtering medium is increased ordecreased in thickness or density to accord with the pressure admittedto the filter.

Various connections may be made to the filter. It ma be connected with acold water su ply o y, Figs. 8 and 10 and the-water passe through thefilter with only an outlet for filtered water. It may have two outlets,one for filtered water, and the other for unfiltered water, Fig. 1, inwhich case the discharge connecting with the filtered water chamberbeing closed, and the other passage being opened, a strong current andwash of water will pass directly through the unfiltered water chamber,and will wash off the grosser impurities which may have accummulatedtlpon the outer surface of the filter bed,

The filter canbe attached to both the hot and cold water suppl and theirrespective ingress being contro ed by'se arate valves (or an ordinary3-way valve, ig. 1,) by this method of connection hot filtered water aswell as cold can be drawn at any time, .and the filter sterilized withthe hot water whenever desired.

When the filter is fitted with outlets for both filtered and unfilteredwater, instead of controlling their res e'ctive discharges by separatevalves, in w ich case one would have to be, shut off and the otheropened, I have shown twodischarge pipes 11 and 12 connected with thebody, one of which is connected to the outlet 8 so that water may bedrawn directly through the body of the device without passing throughthe filtering medium when it is desired to withdraw a body of waterWithout filtering, or to flush out the filter. The'other pipe isconnected to the outlet 8 Fig. 1 so that any water en- 'tering this pipemust first pass through the filtering or purifying medium. These pipes11 and 12 meet in a three-wa passage 13, from which the common disc argepipe 8 leads. Within this three-way passage is fitted a plug 14, thepassage and plug thus forming the complete three-way cook. The passagesthrough this plug or cock are so formed that when the cock is turned inone position unfiltered water will pass through the cock and out throughthe discharge pipe; the passage 11 through which the filtered water willpass being closed. .When turned to another position, the passage of theunfiltered water in the pipe 12 will be closed, and

the passage from the pipe 11 through the cock to the discharge will beopened. Thus either may be opened or closed by turning this single"cock. I

The diaphragm in the plug between the two passages is so made that whileone passage is closed when the other is opened, both of these outletpassages .cannot be closed at the same time, water being able to runaround this-portion of the diaphragm; and this necessitates the closingof the inlet cock 10 when it is desired to shut ofi the flowof theliquid. This insures protection of the filter against the liquid beingadmitted and standing under pressure Within it.

Having thus described my invention, what I claim and desire. to secureby Letters Patent is r 1. In a filter of the character described thecombination of a main frame or body into an interior filtered-waterchamber and an outer unfiltered-water chamber, said peripheral inletconnecting with the unfiltered-water chamber and said outlet connectingwith the filtered-water chamber, and a cap or cover removably secured tothe frame and forming the outer wall of the unfiltered-water chamber.

2. In a filtering and urifying apparatus, a main frame or holder avinginlet and outlet passages through the periphery, and an independentdetachably fitted cover, a plurality of concentric rigid supportingrings of different axial widths located within the main body, and meansfor securing to them superposed layers of a filtering and purifyingmedium to extend across the body between the interior orifices of theinlet and outlet passages; thus forming separate chambers for thefiltered and unfiltered water.

3. In an apparatus for purifying and filtering, a main body having aplurality of outwardly projecting flan ed rims of different axialwidths, detachab e'covers, and means for locking said covers upon theoutward flanges, annular packing between the covers and the body,interior rings and flanges, perforated disks or screens fitting therein,and superposed layers of filtering and purifying media supported uponsaid disks and rings, whereby said media are independently retained inposition, said body having an inlet passage communicating with thechambers exterior to the filtering surfaces, and havspace between saidfiltering media, both passages being through the periphery of main body,and means for controlling the supply and discharge of the liquid.

4, A filtering apparatus consisting of a central body portion,anindepcndent removable cover, incansfor securing superposed layers offiltering and purifying media transversely within said body so as toform chambers upon its 0 )posite sides, an inlet passage connecting withone of said chambers, outlet passages, one connecting with said inletchamber, and the other with the outlet -chamber, and valves whereby thedischarge may be directed across the surface of'the filtering media tothe outlet, or through the filtering media before reaching the outlet.

5. lnan apparatus of the character described, a filter-containing bodyhaving inlet and outlet passages formed in its )criphery, an independentremovable cover, iltcring or purifying media, and means for sccuring thesame transversely within the body to form chambers upon opposite sidesof the purifying media, a valve-controlled inlet passage connecting withthe chamber or chambers exterior to the filtering media, outletpassages, one connccting with the exterior chamber or chambers, and theother with the interior chamber, a three-way cock whereby liquid may bedischarged with or without filtering, said cock having a plug soconstructed that neither discharge passage maybe wholly cut oil thereby.

6. In an apparatus of the character described, a main body withinlet/and outlet passages formed in its periphery, having filtcring andpurifying nic( ia secured transversely therein, and independentremovable caps or covers upon opposite sides, an inlet passage mg adischarge passage connecting with the passage having hot and cold waterconnectlons and a controlling valve or valves, outlet passagescom'iectii'ig respectively with the inthe face of the filtering media,or passed. there-through, a three-way discharge (-ock' or valve in thepath of the discharge passages, said cock having a plug arran ed forsimultaneously opening one of the discharge passages and closing theother, and an intermediate portion of the plug incapable of entirelyclosing both of the passages.

7. he a filtering apparatus of the character described, a main frame orbody, means contained within the main body for securing the filteringand purifying medium in position, said means including fixed andindependently movable clamping rings between which the filter sheets areremovably secured, said fixed clamping rings being concentricallyarranged and having different axial widths.

8. In a filtering apparatus of the character dcscril ed, a main frame orbody having inlet and outlet passages through the periphery, meanscontained within the main body for securing the filtering and purifyingmedium in position, said means including a plurality of fixed andindependently movable elements between which superposed filtershects maybe indepei'idently secured, said fixed elements projecting to differentdistances from the body portion.

9. In a filtering apparatus of the character described, a frame having aplurality of fixed annular interior rings, said rings being of differentaxial widths, foraminous disks, and a lurality' of filtering sheetssupported thereacter described, an exterior frame with covers.

and fixed annular interspaced rings, foraminous disks and a plurality offlexible filter sheets supported upon said rings,'inde ')endent clampingrings to secure the sheets, filtered and unfiltered waterchamberscontiguous to the filter sheets. means for admitting water through thetop of the frame to pass through the filtering medium into the filteredwater chamber, and a stand-pipe within said chamber connecting with anexit passage through the bottom. I]. In a filtering apparatus of thecharacter described, a frame with removable connecting with exteriorchambers, said inlet covers, and interior filtering media fixed to ice 'opening at the top, a discharge opening conform parallel verticallydisposed filtered and In testimony whereof I have hereunto setunfiltered water chambers between which my hand in presence of twosubscribing wit- 10 the filtering media stands, a water supply nesses.

necting with tl1e bottom of the filtered water EDWARD f HJHI' chamber,and a pipe extending upward from Witnesses: said opening to near the topof the filtered GEO. HQSTRONG, water chamber. G. H. NOURSE.

